Taking all option one by one and after putting letters we get;
Option 1) CHMBM
L M B A C H O L M B A C H O L M M A C H O L B B A C H O L M
It does not follow any pattern.
Option 2) CMHBM
L M B A C H O L M B A C M O L M H A C H O L B B A C H O L M
It does not follow any pattern.
Option 3) CHBMM
L M B A C H O L M B A C H O L M B A C H O L M B A C H O L M
It follows a pattern
Option 4) CHMMB
L M B A C H O L M B A C H O L M M A C H O L M B A C H O L B
It does not follow a pattern.
So option (c) is the correct answer.